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Near Zero Impact Backup and Data Replication Appliance

Publishing Venue

IBM

Abstract

Storage networks and intelligent disk subsystems enable new possibilities for the backup of data. This article presents an architecture which integrates the steps for making a consistent copy of the production data using disk subsystem based snapshots (e.g., IBM FlashCopy*), continuing the application on the primary server, and backing up the copied data from a secondary server. The outlined architecture off-loads the backup data transfer from the application server to a secondary server whilst it provides support for heterogenous operating systems of the application server.
The actual architectures today are inflexible because they always demand the same operating system and the same hardware for the backup system. With this the acceptance of application server free backup in the market is low because it needs to duplicate a complex infrastructure. The remarkable difference of the described approach is its flexibility and completeness. It is possible to offer application server free backup service to any other operating system with only setting up one server instance.

Country

Undisclosed

Language

English (United States)

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In today IT systems more and more data (e.g. patient records, web sites) must be
available around the clock. It is no longer acceptable that such data cannot be
accessed during backup. The so called "application server-free backup" is a well
known procedure to backup data with minimal downtime of the application, whilst it
off-loads the I/O burden for the backup data transfer from the application server to
the second server.

Application server-free backup exploits the instant copy feature of modern
disk subsystems. Instant copies can practically copy even terabyte-sized data sets in
a few seconds, and thus freeze the current state of the production data and make it
available via a second access path. The production data can still be read and
changed over the first access path, thus the operation of the actual application can
be continued, whilst at the same time the frozen state of the data can be backed up
via the second access path.

Backup using instant copy must be synchronized with the applications to be backed
up. Databases and file systems buffer write accesses in the main memory in order to
increase their performance. As a result, the data on the hard disk is not always in a
consistent state. Data consistency is the prerequisite for restarting the application
with this data set and being able to continue operation . For backup it should
therefore be ensured that an instant copy with consistent data is first generated . The
procedure looks something like this:

Despite the quiescing and the resuming of the application the production
system is back in operation very quickly.

Data protection with instant copies is even more attractive if the instant copy is
controlled by the application itself: in this case the application must ensure that the
data on disk is consistent and then initiate the copying operation . The application
can then continue operation after a few seconds . It is no longer necessary to
shutdown and restart the application.

Application server-free backup combines instant copies with a second server
which is put to the side of the application server and which serves exclusively for
backup (Figure 1). Both servers are directly connected to the disk subsystem which
stores the production data. For backup the instant copy is first of all generated as
described above: (1) shut down application; (2) generate instant copy; and (3) restart
application. The instant copy can then be accessed from the second computer and
the data is backed up from there without placing a load on the application server . If
the instant copy is not deleted in the disk subsystem, the data can be...